Atomic line versus lens cavity filters: a comparison of their merits

Higgins, Clare R; Pizzey, Danielle; Mathew, Renju S.; Hughes, Ifan G.

doi:10.1364/osac.390604

“…Hence if a large number density [91] is needed, longer cells may be better [92]. The combination of a solenoid and permanent magnets allows us to use a longer cell than in previous oblique investigations [51,70] since the magnitude of the field is largely provided by the permanent magnets while its direction is determined by small adjustments in the solenoid current. This allows easier control of the field magnitude and direction with the permanent magnets set square with the cell resulting in less error in homogeneity.…”

Section: Using An Adapted Version Of the Open-source Software Packagementioning

confidence: 99%

Exploiting non-orthogonal eigenmodes in a non-Hermitian optical system to realize sub-100 MHz magneto-optical filters.

Logue¹,

Briscoe²,

Pizzey³

et al. 2023

Preprint

0

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Non-Hermitian physics is responsible for many of the counter-intuitive effects observed in optics research opening up new possibilities in sensing, polarization control and measurement. A hallmark of non-Hermitian matrices is the possibility of non-orthogonal eigenvectors resulting in coupling between modes. The advantages of propagation mode coupling have been little explored in magneto-optical filters and other devices based on birefringence. Magneto-optical filters select for ultra-narrow transmission regions by passing light through an atomic medium in the presence of a magnetic field. Passive filter designs have traditionally been limited by Doppler broadening of thermal vapors. Even for filter designs incorporating a pump laser, transmissions are typically less than 15% for sub-Doppler features. Here we exploit our understanding of non-Hermitian physics to induce non-orthogonal propagation modes in a vapor and realize better magneto-optical filters. We construct two new filter designs with ENBWs and maximum transmissions of 181 MHz, 42 % and 140 MHz, 17% which are the highest figure of merit and first sub-100 MHz FWHM passive filters recorded respectively. This work opens up a range of new filter applications including metrological devices for use outside a lab setting and commends filtering as a new candidate for deeper exploration of non-Hermitian physics such as exceptional points of degeneracy.

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“…Most magnetooptical filters rely on thermal vapor cells due to their compact and resilient setups [50]. Thermal vapor filters can be tuned by varying the magnetic field, temperature and input polarization [51,52] and can switch between different D-line operation [53]. It has been shown that by cascading cells, line-center or wing features can be selected [54].…”

Section: Introductionmentioning

confidence: 99%

“…By setting the magnetic field at an oblique angle to the k-vector, the system becomes elliptically birefringent and dichroic [67,68]. While oblique filters have been constructed [51,66,69,70], a treatment on how elliptical birefringence can improve filter performance has not yet been presented. In fact, we show that this elliptical birefringence relies on the eigenmodes of the medium being non-orthogonal.…”

Section: Introductionmentioning

confidence: 99%

Exploiting non-orthogonal eigenmodes in a non-Hermitian optical system to realize sub-100 MHz magneto-optical filters.

Logue¹,

Briscoe²,

Pizzey³

et al. 2023

Preprint

0

View full text Add to dashboard Cite

Non-Hermitian physics is responsible for many of the counter-intuitive effects observed in optics research opening up new possibilities in sensing, polarization control and measurement. A hallmark of non-Hermitian matrices is the possibility of non-orthogonal eigenvectors resulting in coupling between modes. The advantages of propagation mode coupling have been little explored in magneto-optical filters and other devices based on birefringence. Magneto-optical filters select for ultra-narrow transmission regions by passing light through an atomic medium in the presence of a magnetic field. Passive filter designs have traditionally been limited by Doppler broadening of thermal vapors. Even for filter designs incorporating a pump laser, transmissions are typically less than 15% for sub-Doppler features. Here we exploit our understanding of non-Hermitian physics to induce non-orthogonal propagation modes in a vapor and realize better magneto-optical filters. We construct two new filter designs with ENBWs and maximum transmissions of 181 MHz, 42 % and 140 MHz, 17% which are the highest figure of merit and first sub-100 MHz FWHM passive filters recorded respectively. This work opens up a range of new filter applications including metrological devices for use outside a lab setting and commends filtering as a new candidate for deeper exploration of non-Hermitian physics such as exceptional points of degeneracy.

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“…Furthermore, in our atomic plasmonic systems, narrow optical atomic bandpass filters work based on induced transmission in atomic transition lines 17 . These narrow line filters are required in atmospheric LIDAR 18 , laser communication 19 , quantum optics 20 or logic processing which is not possible without dynamic switching 21 .…”

Section: Introductionmentioning

confidence: 99%

Multifunctional logic gates based on resonant transmission at atomic-plasmonic structure

Mosleh

¹

,

Hamidi

²

,

Ranjbaran

³

2022

Sci Rep

3

0

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Regarding the confinement of light at nanoscale dimensions in plasmonic structures, we try to show the impact of hot atomic vapor spectroscopy on a miniaturized scale. In such a combined structure, resonant coupling of the atom to plasmonic mode provides diverse ways to control the optical response of the system. We fabricate an atomic plasmonic cell based on Rubidium atomic vapor and gold plasmonic thin film onto the Kretschmann setup to introduce resonant coupling (EIT-like) of atom-plasmons as a tunable all-optical bandpass filter, switch, or logic gates. These all-optical devices such as NOR and XNOR logic gates are well done based on the filter by incidence angle of light, temperature as well as the external magnetic field. We believe the possibility of easy modulation of atomic susceptibility, not only through direct alteration on atoms but also through common methods available for modulation of plasmonic mode, has the potential to design and fabricate modern all-optical devices.

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Atomic line versus lens cavity filters: a comparison of their merits

Cited by 9 publications

References 31 publications

Exploiting non-orthogonal eigenmodes in a non-Hermitian optical system to realize sub-100 MHz magneto-optical filters.

Exploiting non-orthogonal eigenmodes in a non-Hermitian optical system to realize sub-100 MHz magneto-optical filters.

Exploiting non-orthogonal eigenmodes in a non-Hermitian optical system to realize sub-100 MHz magneto-optical filters.

Multifunctional logic gates based on resonant transmission at atomic-plasmonic structure

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